The Process Development of RG 12525 (2-{[4-(Tetrazol-5-ylmethylphenyl)-methoxy]phenoxymethyl}quinoline)
摘要:
This contribution describes process improvements to provide a practical and cost effective synthesis for the manufacture of RG 12525 which resulted in a 3-fold increase in overall yield. Improved solvent systems for chlorination and azidation reactions are described. Adjustments to the tetrazole-forming step eliminated azide sublimation and minimised this risk on scaleup. A robust solvent system was found to control the polymorphic form during crystallisation, which had hitherto been difficult due to the near-equivalence of melting points (154 and 157 degreesC) of the two known forms.
A convergent synthesis of an LTD4 antagonist, RG12525
作者:Adam W. Sledeski、Michael K. O'Brien、Larry K. Truesdale
DOI:10.1016/s0040-4039(96)02460-4
日期:1997.2
An efficient, convergent synthesis of an LTD4antagonist, RG12525 (1) has been achieved through the alkylation of the (2-quinolinylmethoxy)phenol (2) with either a triphenylmethyl protected tetrazole synthon (4a) or with a tetrahydropyranyl derivative (4b). Preparation of synthons 4a and 4b, as well as novel preparation of 2 is described.
Approaches to p-hydroxyphenoxymethylquinolines which avoid intermediate chloromethylquinolines for the synthesis of the LTD4 antagonist, RG 12525
作者:M.K. O'Brien、A.W. Sledeski、L.K. Truesdale
DOI:10.1016/s0040-4039(96)02361-1
日期:1997.1
As part of an effort to develop an industrial synthesis of the LTD(4) antagonist RG 12525 (1), several approaches to the intermediate (2-quinolinylmethoxy)phenol 3 were investigated that avoided the generation of the lachrymatory sensitizer alpha-chloro-2-methylquinoline 2. Utilization of a cyclic sulfate in place of alpha,alpha'-dichloro-o-xylene 4 showed promise as a selective dialkylating agent in the conversion of 3 to RG 12525 (1). (C) 1997, Elsevier Science Ltd. All rights reserved.